Calibration schedule 2016/9/29

Transcription

1 Outline Time links calibration Equipment calibration NIM calibrator: Equipment, characteristics NIM calibrator: Operation Calibration campaign: Data and results 51

2 Calibration schedule 52

3 NTSC calibration by NIM calibrator 53

4 Calibration values Calibration report_ntsc_v2.1.docx BIPM verification Gerard Petit 54

5 Uncertainty evaluation 55

6 56

7 National Institute of Metrology(NIM) Hepingli campus Changping campus 57

8 Structure of time and frequency part at NIM Division of Time and Frequency Metrology Director: Dr. FANG Zhanjun Optical clock group Microwave primary frequency standard group Time keeping group Frequency measurement technique group Hepingli campus& Changping campus Hepingli campus& Changping campus Hepingli campus& Changping campus Hepingli campus K. Liang, et al, Comparison of Time and Frequency Transfer by BDS and GPS, URSI GASS

9 Fountain clock NIM5: 1.4e-15, submit data to BIPM since 2014, NIM6 in building Sr optical lattice clock: 2.3e-16 Reported to CCL-CCTF in TWSTFT earth stations in use: 1 for Euro-Asian link and 1 for comparison in homeland Two campuses, 8 masers and 10 Cs clocks, 6 masers and 7 Cs clock for TAI K. Liang, et al, Comparison of Time and Frequency Transfer by BDS and GPS, URSI GASS CMCs in T&F 59

10 60

11 Status of GNSS time transfer at NIM NIMTFGNSS-1 NIMTFGNSS-2 Portable using type GPS + GLONASS rack using type without temperature chamber

12 Carrier phase(ppp) CCD results using IM03 and IM07 (NIMTFGNSS-1 receivers) 85 ps (1 sigma) LIANG Kun,,ZHANG Aimin, GAO Xiaoxun, WANG Weibo, NING Dayu,ZHANG Side, Study and Development of a New GNSS Receiver for Time and Frequency Transfer, EFTF

13 NIMTFGNSS-3(BDS) 63

14 Unknow reason CGGTTS data Double difference IM07: NIMTFGNSS-1 IM2P: Septentrio PolaRx2eTR Liang, Kun; Jin, Zhaofeng; Pei, Chao; Zuo, Fei; Zhang, Aimin, Preliminary Implementation of Time and Frequency Transfer by BDS, Proceedings of IFCS-EFTF

15 GNSS carrier phase processing GPSTFT for GPS carrier phase Time and frequency reference External time and frequency Time and frequency transfer receiver Having the ability to observe GPS L1 and L2 carrier phase Time and frequency transfer receiver External time and frequency Time and frequency reference Obsevation data PC( collecting and controlling) RINEX data file Obsevation data PC( collecting and controlling) RINEX data file RINEX data Data processing and parameter estimating Result data Data pre-processing Error modelling and compansating Observation equation solution Result processing and analyzing 65

16 CCD P3 std:639 ps Processed by selfdeveloped software No climate control Processed by modified GPSTFP CP std:17 ps Kun Liang, et al, GPS Carrier Phase Time Transfer Using a Modified Solution Mode, IFCS

17 Lower stability could be because of the excellent consistency of two BDS receivers using the same antenna and antenna cable and regional augment effect of the GEO constellation 67

18 40 km baseline Processed by software officially used by BIPM Consistency can be achieved in general. 68

19 Receivers at NIM 13 GNSS time and frequency transfer receivers in used, including 3 for TAI links. 69

20 The backup NIM calibrator For the more needs for calibration at the same time Roughly the same structure with the main NIM calibrator(one GTR51 receiver(im12) and one NIMTFGNSS-2 receiver(im20)). More compact for one cabinet package To be finished in two months 70

21 NIM time link calibration history 2004, by BIPM, failed 2009, by BIPM, 20 ns to 5 ns CalibGeo_NIM-2009 by BIPM 2012, create the new UTC(NIM) in the New campus, selfcalibrated by NIM, reported to BIPM, 5 ns maintained Calibration Report of Time Transfer Links between NIM(New Campus) and PTB by GPS by NIM 2014, by BIPM, consistent with the results in 2012 by 0.8 ns, 1.7 ns TM234_METODE_2014(VII)atNIM and TM243_Group1-reference-values_V7 by BIPM 2016, by BIPM by consistent with the results in 2014 within about 1 ns, not published TM264_METODE_2016(XIII)atNIM_V1 by BIPM 71

22 Calibration that have been implemented NTSC BIRM(the receiver not for TAI and TAI receiver to be calibrated) BSNC SIMT BOIMT EPRI WIPM(CAS) ZJIM LNMI 72

23 Thank you! 谢谢! 73